- #1

- 54

- 0

thanks.

You are using an out of date browser. It may not display this or other websites correctly.

You should upgrade or use an alternative browser.

You should upgrade or use an alternative browser.

- Thread starter ZeroPivot
- Start date

- #1

- 54

- 0

thanks.

- #2

UltrafastPED

Science Advisor

Gold Member

- 1,912

- 216

- #3

- 54

- 0

i know, but i meant for the exam will => do the trick?

- #4

Office_Shredder

Staff Emeritus

Science Advisor

Gold Member

- 4,436

- 519

On an exam you are likely to be expected to write [itex]\displaystyle \lim_{x\to a} [/itex] on every single line, unless you are actually writing something down which is not a limit. Your instructor's opinion may vary (you should ask them if you feel it's really important), but I find it unlikely. There are two reasons for this

1.) Writing six characters four or five times doesn't take that much time.

2.) A LOT of students don't understand what limit notation actually means, so instructors absolutely need to grade on correctness here.

3.) You should never write down things which are not mathematically true on an exam, and this is no exception.

1.) Writing six characters four or five times doesn't take that much time.

2.) A LOT of students don't understand what limit notation actually means, so instructors absolutely need to grade on correctness here.

3.) You should never write down things which are not mathematically true on an exam, and this is no exception.

Last edited:

- #5

Mark44

Mentor

- 34,904

- 6,648

- #6

HallsofIvy

Science Advisor

Homework Helper

- 41,833

- 963

- #7

- 269

- 24

- [itex]\forall x, \enspace f(x)=g(x)=h(x)=k(x)[/itex].

- Therefore [itex]\lim_{x\to a}f(x)=\lim_{x\to a}k(x)=M[/itex].

- #8

- 54

- 0

some of the lims get a bit complicated and keep writing lim x->a all the time like 10 times is a pain in the butt.

- #9

Mark44

Mentor

- 34,904

- 6,648

some of the lims get a bit complicated and keep writing lim x->a all the time like 10 times is a pain in the butt.

Then you can do it like economicsnerd suggests below.

- [itex]\forall x, \enspace f(x)=g(x)=h(x)=k(x)[/itex].

- Therefore [itex]\lim_{x\to a}f(x)=\lim_{x\to a}k(x)=M[/itex].

- #10

HallsofIvy

Science Advisor

Homework Helper

- 41,833

- 963

Yep, that's "painfully lazy"!some of the lims get a bit complicated and keep writing lim x->a all the time like 10 times is a pain in the butt.

I, on the other hand, am painfully lazy but NOT brilliant.

Share: